Artificial tooth



R. J. PARK.

ARTIFICML TOOTH.

APPLICATION FILED JAN. 28, 1921 Patented Jan. 24, 1922.

PATENT OFFICE.)

RUSSELL J. PARK, 01 ST. LOUIS, MISSOURI.

- ARTIFICIAL TOOTH.

Specification of Letters Patent. Patented 24 1 2 Application filed January 28, 1921. Serial No. 440,781.

To all whom it may concern:

Be it known that I, RUSSELL J. PARK, a citizen of the United States, residing at St. Louis and State of Missouri, have invented certain new and useful Improvements in an Artificial Tooth, of which the following is a specification.

This invention relates to new and useful im rovements in an artificial tooth.

ne object of the invention is to provide an artificial tooth, which is formed at its cervical end with a deep socket in which the material of the plate runs while in a lastic state to form an anchor post where v the tooth and plate are securely anchored together when the material of the plate hardens.

Another object of the invention is to provide an artificial tooth whose cervical end is so formed as toma-kea nice fit with the material of the plate, thus forming a smooth surface and eliminating all cavities or recesses between thetooth and plate so that the teeth may be readily cleansed.

Another object of the invention is to provide an artificial tooth which may be secured to the plate and firmly held in position without the use of pins or other fastening means.

lVith the above and other objects in view the invention has particular relation to certain novel features of construction, arrangement of parts and use, an example of which is given in this specification and illustrated in the accompanying drawings, wherein Figure 1 shows a side view of a plate provided with teeth embodying the invention and shown partially in section.

Figure 2 is an anterior or front Figure 3 is a posterior view.

Figure 4 is a vertical sectional view, and

Figure 5 is a transverse sectional view taken on the line 5 5 of Figure 4.

Referring now more particularly to the drawings, wherein like numerals of reference designate similar parts in each of the figures, the numeral 1 designates a. plate which is preferably formed of rubber. It is to be understood that the teeth are to be attached to this plate while the plate is in plastic state and before it has hardened.

The numeral 2) desi ates a frontal tooth. The cervical end of t is tooth is of considerable thickness and is formed with the abrupt shoulder 3, substantially at right angles to the line of bite, the front portion 4 of said cervical end extending upwardly around the lower part of the plate. The cervical end of the tooth on the side'toward the plate has an inward, pro ection 5 which is undercut all the way round so that said rejection 5 is dovetailed in form and this ormation provides the abrupt edge 6, and when the material of the plate hardens, the tooth is thereby anchored firmly in place and the edge 6 forms the line of contact for the material of the plate, thus forming a uniform and perfect line of contact and giving a finished appearance to the plate and eliminating the collection of deposits in between the tooth and plate. For the purpose of further anchoring the tooth to the plate the cervical end of the tooth has a deep socket 7 into which the material of the plate is forced while said material is plastic and when the material hardens therein it forms an anchor post 8, which gives strength to the anchorage and makes it impossible to break the tooth from the plate by ordinary usage.

What I claim is 1. An artificial tooth whose cervical end is formed with an abrupt shoulder having a deep socket, and an upwardly extending front portion rovided with an undercut arcuate projectlon formed integrally-with and following the contour of the cervical end of the tooth.

2. An artificial tooth, the posterior side of whose cervical end is formed with a projection which is integral therewith and which is undercut all of the way round, forming a groove on each side into which the material of the plate may harden, said cervical end also being provided with a deep socket into which said material hardens, forming an anchor post.

3. A tooth, the posterior side of the cervical end of which is formed with a projection, said projection being undercut all the way round, forming a groove into which the material of the plate will flow when in plastic state, an abutting shoulder-following the contour of said groeve and forming the name to this specification in the presence of outer side thereof, against which the material two subscribing Witnesses.

of the plate abuts, said cervical end. also being provided with a. deep socket into which 5 the material of the plate forms and hardens,

forming an anchor post.

In testimony whereof I have signed my RUSSELL J. PARK.

Witnesses:

R. M. SMITH, W I. A. CATHEY.. 

